Closed-Loop Splines

A closed-loop URoadSplineComponent lets you place various “islands” or extra road marks on roads, such as refuge islands, pedestrian crossings, or arrows:

To start using a closed-loop spline, set two parameters on the URoadSplineComponent in the Details Panel:

• Set Spline -> Closed Loop to true

• Set Road -> RoadLayout -> LoopedRoadZone to a Driving or Sidewalk Road Zone

After this, the URoadSplineComponent turns into a familiar polygon-drawing tool:

In the Draw Spline Tool you can start drawing a closed-loop URoadSplineComponent immediately. To do this, set the following parameters in the tool:

• Set Road Spline -> Loop to true

• Set Road Spline -> LoopedRoadZone to Driving or Sidewalk

In the Details Panel of the URoadSplineComponent you can set the texture-coordinate parameters for the fill — angle and scale (LoopedRoadZoneTexAngle / LoopedRoadZoneTexScale):

Important

Keep the drawn “islands” in the same actor and SubGroup as the main road surface (the logically related URoadSplineComponents). That way baking generates the whole road section as a single seamless unit.

See also

• Road Zones and Zone Types — the Driving / Sidewalk zone a LoopedRoadZone fills with.

• Draw Spline Tool — draw a closed-loop spline directly.

• Bake: spline grouping — keep islands in one actor + SubGroup to bake seamlessly.